Tool for truing and dressing commutators.



P-ATENIIED JUNE 25. 1907.

0. H. FRicK. TOOL FOR TRUING AND DRESSING COMMUTATORS.

Lmw i INVENTOR.

APPLICATION FILED OUT. 2, 1906.

A TTORNE VS UNITED STATES PATENT OFFICE TOOL FOR TRUING AND DRESSING COIVIIVIUTATORS- Specification of Letters Patent.

Patented June 25, 1907.

Application filed October 2, 1906. Serial No- 337.113.

To ILZZ whom, zit Nuty concern:

Be it known that I, CLAUs HENRY FRICK,

a citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented a new and useful Tool for Truing and Dressing Commutators, of which the following is a specification.

This invention relates to tools for truing and dressing the commutato'rsof dynamos, motors and similar electrical machines and more particularly to a tool especially designed for planing and dressing the commutators of motors employed for propelling cars and other rolling stock.

The object of the invention is to provide a comparatively simple and inexpensive tool capable of being readily placed in position on the motor-casing and by means of which the commutator may be quickly and conveniently dressed without the necessity of removing the armature. A

A lnrther object is to provide a supporting frame having a cutting tool mounted for vertical and lateral movement thereon whereby when the armature is rotated the entire surface of the commutator may be effectually dressed A still further object of the invention is to generally improve this class of devices so as to increase their utility, durability and efficiency.

WVith these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, and illustrated in the accompanying drawings, it being understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims.

In the accompanying drawings forming a part of this specification: Figure 1 is a side elevation partly in section of a car-motor showing a tool constructed in accordiance with my'invention in position thereon. Fig. 2 is a perspective view of the tool detached. Fig. 3 is a transverse sectional view.

Similar numerals of reference indicate corresponding parts in all of the figures of the drawings.

The improved device is principally designed for use in connection with that class of motors in which theconnnutator and commutator brushes are housed within the easing of the motor and by Way of illustration is shown applied to a motor of the ordinary car-type in which 5 designates the casing and 6 the armature having the usual commutator 7 The tool consists of a substantially rectangular supporting plate 8 adapted to extend across'the brush-receiving opening 9 after the usual yoke or closure has been removed, said plate being provided with an elongated slot 10 and a pair of spaced apertures 11 adapted to register with the openings in the i i casing for the yoke fastening devices and designed to receive suitable belts or similar fastening devices 11 for securing the tool in position on the motor-casing.

Carried by the plate 8 and adjustable longitudinally of the same is a bar orshank 12 which extends through the slot 10 and is provided with a transverse recess 13 having a vertical recess 14 communicating therewith and extending through the top of the bar for the reception of a clamping screw 15. The bar 12' is provided with oppositely disposed shoulders 16 adapted to bear against the lower face of the plate 8 and is provided at its lower end with a vertically disposed slot or recess 17 for the reception of a cutting tool 18.

Surrounding the upper end of the bar 12 and bearing against the surface of the plate 8 is a bearing plate or disk 19, there being a locking key 20 interposed between the plate 19 and the screw 15 to assist in preventing accidental displacement of said bar. Extending longitudinally of the slot 10 is a threaded rod 21 which engages a correspondingly threaded opening 22 formed in the bar 12 and is proivded with a hand-operated wheel 23 by means of which the cutter 18 may be adjusted longitudinally of the commutator 7 thus permitting the entire surface of the commutator to be dressed or trued.

The cutter 18 is slidably mounted for vertical movement in a guide yoke 24 preferably consisting of an eye having a threaded shank which extends through the bar 12 for engage ment with a clamping nut 25, the upper end of said cutter being provided with a laterally extending lug 26 thefree end of which is bifurcated for the reception of the adjacent end of an adjusting screw 27. The adjusting screw 27 is threaded in a perforated lug 28 secured to the bar 12 and is provided with a squared end 29 for engagement with a wrench or similar tool whereby the screw may be adjusted to vary the position of the cutter.

When it is desired to plane or dress the commutator, the brush yoke and brushes are removed from the casing and the supporting plate 8 extended transversely across the opening 9 in said casing and secured in position thereon by means of the bolts 11. The cutter is then adjusted and the motor started, the operator gradually turning the handwheel 23 so as to cause the cutter to travel over the entire surface of the commutator and thus effectually dress the same. After the truing or dressing operation is completed the tool is removed from the motor and the brush and yoke again placed in position and fastened in the usual manner.

From the foregoing description it is thought that the construction and operation of the device will be readily understood by those skilled in the art and further description thereof is deemed unnecessary.

Having thus described the invention what is claimed is:

1. A device of the class described comprising a supporting plate having a longitudinal slot formed therein, a cutter carrying bar eX- tending through said slot and having its upper end provided with a transverse recess, a key extending through the transverse recess, a bearing plate interposed between the key and the upper surface of the supporting plate, and a clamping screw threaded in the bar and bearing against the key.

2. A tool of the class described comprising a supporting plate having a longitudinal slot formed therein, a cutter carrying bar extending through said slot and provided with a transverse recess, a shoulder formed on the bar and adapted to engage the supporting plate, a locking key seated in the transverse recess, a clamping screw carried by the bar and engaging the key, and a threaded rod journaled in the walls of the slot and extend ing through a correspondingly threaded opening in the bar for adjusting the latter lolngitudinally with respect to the supporting p ate.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

CLAUS HENRY FRICK.

Witnesses:

SAMUEL MEYERS, ToM J. DESMUKE. 

